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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-84761] MigrationSourceManager may fail to emit the migrateChunkToNewShard due to stale ChunkManager info</title>
                <link>https://jira.mongodb.org/browse/SERVER-84761</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The scenario may be reproduced through the following sequence:&lt;/p&gt;

&lt;p&gt;1. A migration with &lt;tt&gt;&quot;nss: collName, from: shardId1, to: shardId2&quot;&lt;/tt&gt; starts; the &lt;tt&gt;MigrationSourceManager&lt;/tt&gt; gets instantiated on &lt;tt&gt;shardId1&lt;/tt&gt;, and &lt;a href=&quot;https://github.com/10gen/mongo/blob/dd42ba85cb0ea76e45fe1ef7c1096ca2a4a7cc41/src/mongo/db/s/migration_source_manager.cpp#L223-L225&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;placement information&lt;/a&gt; gets retrieved; at the time of the retrieval, &lt;tt&gt;shardId2&lt;/tt&gt; owns 1 collection chunk&lt;br/&gt;
2. A concurrent migration with &lt;tt&gt;&quot;nss: collName, from: shardId2, to: anotherShardId&quot;&lt;/tt&gt;  gets concurrently committed; &lt;tt&gt;shardId2&lt;/tt&gt; loses its last chunk (and the &lt;a href=&quot;https://github.com/10gen/mongo/blob/ff1cdbf537d207b856a20d06805b1fbccc30761b/src/mongo/db/s/migration_source_manager.cpp#L622-L624&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;related op entry&lt;/a&gt; gets emitted)&lt;br/&gt;
3. The migration started on step 1 is resumed; since &lt;tt&gt;shardId2&lt;/tt&gt; reacquires its first collection chunk, a &lt;tt&gt;migrateChunkToNewShard&lt;/tt&gt; should be emitted - but the placement information is stale at the &lt;a href=&quot;https://github.com/10gen/mongo/blob/63d65b6ad3dfcb280e51ab4c1b744ff3530a6f97/src/mongo/db/s/migration_source_manager.cpp#L441&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;time it gets evaluated&lt;/a&gt;&lt;/p&gt;
</description>
                <environment></environment>
        <key id="2543310">SERVER-84761</key>
            <summary>MigrationSourceManager may fail to emit the migrateChunkToNewShard due to stale ChunkManager info</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="paolo.polato@mongodb.com">Paolo Polato</assignee>
                                    <reporter username="paolo.polato@mongodb.com">Paolo Polato</reporter>
                        <labels>
                    </labels>
                <created>Thu, 11 Jan 2024 15:13:16 +0000</created>
                <updated>Tue, 6 Feb 2024 14:04:02 +0000</updated>
                                            <version>5.3.0</version>
                    <version>3.6.0</version>
                    <version>4.0.0</version>
                    <version>4.2.0</version>
                    <version>4.4.0</version>
                    <version>5.0.0</version>
                    <version>5.2.0</version>
                    <version>5.1.0</version>
                    <version>6.0.0</version>
                    <version>6.1.0</version>
                    <version>6.2.0-rc0</version>
                    <version>6.3.0</version>
                    <version>7.0.0</version>
                    <version>7.1.0</version>
                    <version>7.3.0-rc0</version>
                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                    <issuelinks>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="2265239">SERVER-74032</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="2560731">SERVER-85914</issuekey>
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